feat(#142): ouvrir la modale au clic sur les cartes du dashboard admin.

Unifie le comportement des listes Parents, AM, Enfants, Gestionnaires, Admins et À valider avec le bouton d'action au survol.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/widgets/admin/common/admin_enfant_user_card.dart

@@ -33,6 +33,7 @@ class AdminEnfantUserCard extends StatelessWidget {
   final String? photoUrl;
   final List<String> subtitleLines;
   final List<Widget> actions;
+  final VoidCallback? onCardTap;
 
   const AdminEnfantUserCard({
     super.key,
@@ -40,12 +41,14 @@ class AdminEnfantUserCard extends StatelessWidget {
     this.photoUrl,
     required this.subtitleLines,
     this.actions = const [],
+    this.onCardTap,
   });
 
   factory AdminEnfantUserCard.fromEnfant(
     EnfantAdminModel enfant, {
     List<String> extraSubtitleLines = const [],
     List<Widget> actions = const [],
+    VoidCallback? onCardTap,
   }) {
     final parents = enfant.parentLinks
         .map((l) => l.parentName ?? 'Parent')
@@ -64,6 +67,7 @@ class AdminEnfantUserCard extends StatelessWidget {
         ],
       ),
       actions: actions,
+      onCardTap: onCardTap,
     );
   }
 
@@ -71,6 +75,7 @@ class AdminEnfantUserCard extends StatelessWidget {
     ParentChildSummary child, {
     List<String> extraSubtitleLines = const [],
     List<Widget> actions = const [],
+    VoidCallback? onCardTap,
   }) {
     return AdminEnfantUserCard(
       title: child.fullName,
@@ -82,6 +87,7 @@ class AdminEnfantUserCard extends StatelessWidget {
         extra: extraSubtitleLines,
       ),
       actions: actions,
+      onCardTap: onCardTap,
     );
   }
 
@@ -93,6 +99,7 @@ class AdminEnfantUserCard extends StatelessWidget {
       avatarUrl: photoUrl,
       subtitleLines: subtitleLines,
       actions: actions,
+      onCardTap: onCardTap,
     );
   }
 }